AT holding 2nd gear to high revs during a long left turn - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EK_Golfer · 03-01-2013, 12:15 AM

Hey guys, I haven't seen this mentioned anywhere and I wanted to see if this was normal. With the car in lazy full auto mode (sport mode off), during a long left turn, the car will not shift out of second until after the car straightens out for a bit after the turn. I'm not mashing on the accelerator or anything and the engine will rev up to 4k+ rpm which is definitely high when not using sport mode. Could it be when the car senses the weight shift during a turn (limited slip differential kicking in) the AT will instinctively hold the current gear?

edward · 03-01-2013, 12:40 AM

IIRC, It's a feature. Shifting mid-turn unsettles the chassis, which could result in a spin if you're driving at the limit, so the transmission tries to avoid this.

I could be wrong here, but I think I remember reading about this. I drive an MT, so I can't test this.

fistpoint · 03-01-2013, 12:42 AM

Quote:

Originally Posted by edward

IIRC, It's a feature. Shifting mid-turn unsettles the chassis, which could result in a spin if you're driving at the limit, so the transmission tries to avoid this.

That's exactly what I pictured in my head when reading his post. It makes sense.

EK_Golfer · 03-01-2013, 01:04 AM

Quote:

Originally Posted by edward

IIRC, It's a feature. Shifting mid-turn unsettles the chassis, which could result in a spin if you're driving at the limit, so the transmission tries to avoid this.

I could be wrong here, but I think I remember reading about this. I drive an MT, so I can't test this.

Yeah I was thinking this was the reason, but wasn't sure if the AT was programmed that way. Just making sure my tranny is going crazy on me.

KayC · 03-01-2013, 05:35 AM

The car is telling you to power out and kick the tail out

trinitron · 03-01-2013, 08:35 AM

I don't think it is an issue. Just tap the paddle shifter and upshift

MVJ1975 · 03-01-2013, 08:40 AM

Yes, normal behavior. Even in "lazy" mode it's more aggressive than your average autobox.

naikaidriver · 03-01-2013, 09:01 AM

All FRS's are equipped with accelerometers that are tied into the ECU. This is how the VCS Sport function gets its attitude adjustment data to let you get a "little" sideways before the TCS and VCS kicks in.

Because of this, in an auto, the ECU may hold a shift for the same reasons stated above. Its even more exaggerated when the transmission is in "Sport" mode.

Scott

Asphalt~86 · 03-01-2013, 09:20 AM

Quote:

Originally Posted by naikaidriver

All FRS's are equipped with accelerometers that are tied into the ECU. This is how the VCS Sport function gets its attitude adjustment data to let you get a "little" sideways before the TCS and VCS kicks in.

Because of this, in an auto, the ECU may hold a shift for the same reasons stated above. Its even more exaggerated when the transmission is in "Sport" mode.

Scott

This. When you put in Sport you will definitely notice the exaggeration of it holding the shift out. I found the spot now and it's easy to overcome if you just want a quick upshift with the paddles.

EK_Golfer · 03-01-2013, 11:35 AM

Quote:

Originally Posted by KayC

The car is telling you to power out and kick the tail out

On my way to work, there is a large intersection with a huge left turn, I would love nothing more than to slide through that turn like a boss.

03-01-2013, 12:15 AM	#1
EK_Golfer Senior Member Join Date: Dec 2012 Drives: 2013 Whiteout FR-S AT Location: USA Posts: 174 Thanks: 29 Thanked 34 Times in 28 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	AT holding 2nd gear to high revs during a long left turn Hey guys, I haven't seen this mentioned anywhere and I wanted to see if this was normal. With the car in lazy full auto mode (sport mode off), during a long left turn, the car will not shift out of second until after the car straightens out for a bit after the turn. I'm not mashing on the accelerator or anything and the engine will rev up to 4k+ rpm which is definitely high when not using sport mode. Could it be when the car senses the weight shift during a turn (limited slip differential kicking in) the AT will instinctively hold the current gear?

03-01-2013, 09:01 AM	#8
naikaidriver Senior Member Join Date: Aug 2012 Drives: 2013 Scion FR-S AT Asphalt Location: Lynnwood, WA Posts: 770 Thanks: 145 Thanked 673 Times in 289 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	All FRS's are equipped with accelerometers that are tied into the ECU. This is how the VCS Sport function gets its attitude adjustment data to let you get a "little" sideways before the TCS and VCS kicks in. Because of this, in an auto, the ECU may hold a shift for the same reasons stated above. Its even more exaggerated when the transmission is in "Sport" mode. Scott __________________

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Voice Commands with new turn by turn in IOS6?	jadewbj	Electronics \| Audio \| NAV \| Infotainment	0	09-21-2012 11:11 AM
Anyone still holding out for BeSpoke?	MrFRsLa	Electronics \| Audio \| NAV \| Infotainment	23	07-20-2012 05:24 AM
AC cuts out at high revs. Cool feature?	Superhatch	BRZ First-Gen (2012+) — General Topics	9	06-28-2012 03:13 PM
Moto Miwa: First batch of BRZ's and FRS left Japan for Long Beach, CA	feedbag	BRZ First-Gen (2012+) — General Topics	442	06-03-2012 03:54 PM

03-01-2013, 12:40 AM	#2
edward Member Join Date: Jan 2013 Drives: 2013 BRZ - Sterling Silver Metallic Location: CA Posts: 84 Thanks: 74 Thanked 32 Times in 23 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	IIRC, It's a feature. Shifting mid-turn unsettles the chassis, which could result in a spin if you're driving at the limit, so the transmission tries to avoid this. I could be wrong here, but I think I remember reading about this. I drive an MT, so I can't test this.

03-01-2013, 05:35 AM	#5
KayC Senior Member Join Date: Dec 2012 Drives: 2013 whiteout FRS 6mt Location: Vancouver BC Posts: 106 Thanks: 72 Thanked 59 Times in 27 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The car is telling you to power out and kick the tail out

03-01-2013, 08:35 AM	#6
trinitron Senior Member Join Date: Nov 2011 Drives: gts 86 Location: Melbourne Posts: 143 Thanks: 30 Thanked 30 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I don't think it is an issue. Just tap the paddle shifter and upshift

User Name		Remember Me?
Password